Discover the extreme, violent, x-ray universe! X-rays are produced in the cosmos when matter is heated to millions of degrees, where high magnetic fields, or extreme gravity, or explosive forces, occur. Check out the worlds of black holes, quasars, supernovas and other explosive activity in the universe!
http://chandra.harvard.edu/

ALEXIS Educational Information
The resources related to ALEXIS provide general information for teachers, a glossary, crosswords, pictures, and references.
http://nis-www.lanl.gov/~asocops/education_outreach.html

Cosmic and Heliospheric Learning Center
This learning center looks at the basics of astrophysics, cosmic rays, space weather, and the sun.
http://helios.gsfc.nasa.gov

Cosmic Journeys
Cosmic Journeys explains missions from the Structure and Evolution of the Universe (SEU) Forum and provides resources related to those missions.
http://universe.gsfc.nasa.gov

GLAST Education and Public Outreach
GLAST's outreach program highlights news, explanations, student and teacher resources, and programs and materials related to the Gamma Ray Large Area Space Telescope.
http://www-glast.sonoma.edu

The Goldstone Apple Valley Radio Telescope (GAVRT) Project
The GAVRT project with NASA-JPL/Caltech gives K-12 teachers nationwide access a radio telescope via the Internet and an opportunity to participate in collecting data for NASA/JPL scientific studies of our galaxy and beyond.
http://lewiscenter.org/force/1112/subprojects/aboutgavrt.php

Gravity Probe B: The Relativity Mission
Gravity Probe B's mission-related resources include background, lesson plans, handouts, Q&A, and press clips.
http://einstein.stanford.edu/index.html